adj. caused by factors from outside the body, rather than from an abnormality of internal functions; -- of illness.

adj. not synthesized within the organism; absorbed or assimilated from outside the organism.

from The Century Dictionary and Cyclopedia

Growing by additions on the outside; specifically, in botany, belonging to or characteristic of the class of exogens.

Produced on the outside, as the spores of hyphomycetous and many other fungi; growing out from some part: specifically applied in anatomy to those processes of a vertebra which have no independent ossific centers of their own, but are mere outgrowths.

In geology, applied by Von Humboldt to extrusive, volcanic rocks, in contrast to endogenous rocks. See endogenous, 3.

Examples

If the marketplace has withdrawn buyers, this is called exogenous liquidity risk a characteristic of the market which is a collection of buyers; a typical indicator here is an abnormally wide bid-ask spread.

For the record, my greatest concern with desiccated thyroid (or levothyroxine or T3) is when they prescribed in a manner that results in long-term exogenous hyperthyroidism.

In botany you learn of two kinds of plants -- those which grow by external accretions, as bulbs, which, are called exogenous? and plants which grow within outward, which are called endogenous A great philosopher has said that "man is that noble endogenous plant which grows, like the palm, from within outward."